NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2014-10-16 | 901-468 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | COLLIERVL | TN |
| 2010-03-09 | 901-654 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| 2009-02-23 | 901-302 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| 2007-01-25 | 901-636 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| 2006-10-17 | 901-653 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| 2005-03-22 | 901-701 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| 2004-11-08 | 901-692 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-259 | not yet reported which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-260 | not yet reported which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-261 | 9XXX which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-271 | not yet reported which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-435 | 1XXX2XXX3XXX6XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
| — | 901-451 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | ARLINGTON | TN |
| — | 901-457 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | COLLIERVL | TN |
| — | 901-507 | 6XXX7XXX8XXX which blocks → | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | MEMPHIS | TN |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.